The person told The Associated Press that Ingmar Guandique's arrest is imminent and an official announcement is expected soon. The person was not authorized to discuss the case publicly and spoke on condition of anonymity.
Levy had just completed an internship with the U.S. Bureau of Prisons when she went missing in May 2001 in Washington, D.C. The 24-year-old was wearing jogging clothes when she vanished, and her remains were discovered in Rock Creek Park a year later.
Authorities questioned former U.S. Rep. Gary Condit in Levy's disappearance, but he was never a suspect in her death. Condit was reportedly having an affair with Levy, and the negative publicity from the case was cited as a main reason the California lawmaker lost re-election in 2002.
Guandique, 27, has denied any involvement in Levy's disappearance and killing. However, investigators interviewed him in the Levy case after he was convicted of attacking two women joggers in Rock Creek Park shortly after her disappearance.
Guandique was sentenced to 10 years in federal prison for those attacks. The federal Bureau of Prisons lists an inmate in California with the same sentence and age, but with the spelling Guandigue instead of Guandique. A message seeking comment was not returned.
Levy's father, Robert Levy, said Washington, D.C., Police Chief Cathy Lanier called his home late Friday and said there would be an arrest in a few days.
Robert Levy said he and his wife, Susan, were not told the identity of the person to be arrested "but we all know who it is." He would not elaborate but said they would favor a life sentence for the killer.
"If someone is executed, they really don't suffer too much," he said from his home in Modesto, Calif.
A law enforcement official who spoke to investigators said Saturday that the break in the case came in part from DNA evidence. The official, who spoke on the condition of anonymity because the Levy investigation is ongoing, said DNA evidence was either retested or collected, and it was connected to Guandique.
The official said D.C. police have interviewed Guandique at least twice, and the case has been sent to a grand jury.
An attorney for Condit said the new revelations clear the former congressman.
"This should give the Levys the answer and closure they deserve, and remove the unfair cloud that has hung over the Condits for too long," said Abbe Lowell, a Washington lawyer.
The Levys said the news did not make up for the loss of their daughter.
Photographs of Chandra adorned the living room of the Levy home, which sits on a quiet street in a suburban community surrounded by farms and orchards. The piano she played remains in the front room, but is now out of tune. Her bedroom has become part storage area and part shrine, with more pictures of Chandra hanging next her mother's paintings.
"There's not a day or night it's not on our minds," Susan Levy said. "When it comes to holiday time and family get-togethers, there's a big void."
Lanier, the D.C. police chief, said Saturday her department had no information to release in the ongoing case.
"This case generated numerous bits of information, which we continue to follow up on," she said in a statement.
Susan Levy said the couple had been meeting with a special task force of Washington police working on the case. "We got the attention that may lead to an arrest and a conviction," she said.
After Condit lost his re-election bid, he sued several media outlets that had connected him to Levy's disappearance and death. He reached an undisclosed settlement with three tabloid newspapers.
Associated Press writers Matt Apuzzo in Washington and Samantha Young in Modesto, Calif., contributed to this report.